Portion of a shoe midsole



FIG. 1 is a front perspective view of a shoe showing my new design of a portion of a shoe midsole;

FIG. 2 is a rear perspective view thereof; and,

FIG. 3 is a side elevational view of one side thereof.

The broken line showing immediately adjacent to the shaded area represents an unclaimed boundary of the design. The broken line showing of the remainder of the shoe is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a shoe midsole, as shown and described. 